EFS

Question 1

What does EFS stand for?

Answer 1

Elastic File System

Question 2

What are the key differences between EFS and EBS?

Answer 2

1. Sharing across instances – EBS only attaches to one EC2 instance (excpet for with Multi-Attach); EFS can be shared across mutliple instances
2. Sharing across AZs and Regions – EBS volume must be in the same region as the instance(s), EFS can be shared across AZs and has cross-region replication
3. Price (EFS more expensive)

Question 3

How does storage capacity work in Amazon EFS?

Answer 3

With EFS, storage capacity is elastic, growing and shrinking automatically as you add and remove files, so your applications have the storage they need, when they need it.

Question 4

Does EFS support NFSv4 protocol?

Answer 4

Yes

Question 5

What is the pricing model for EFS?

Answer 5

You only pay for the storage you use (no pre-provisioning required)

Question 6

How high can EFS scale its storage?

Answer 6

Up to the Petabytes

Question 7

Can EFS support multiple concurrent NFS connections?

Answer 7

Yes, in fact up to thousands of them

Question 8

How does EFS ensure high availability and redundancy of data?

Answer 8

Data is stored across multiple AZs within a region

Question 9

What is the data consistency model for EFS?

Answer 9

EFS has Read after Write consistency

Question 10

Can EFS be used within multiple VPCs at the same time?

Answer 10

No

Question 11

In EFS, what is the difference and tradeoff between General Purpose Performance Mode vs. Max I/O Performance Modes

Answer 11

Max I/O Performance mode better handles tens+ applications going to the same EFS at the cost of slightly higher latency